Seletskiy, S. Blaskiewicz, M. Fedotov, A.V. Kayran, D. Kewisch, J. Miller, T.A. Thieberger, P. JACoW Geneva, Switzerland 978-3-95450-180-9 10.18429/JACoW-NAPAC2016-WEPOB62 English 1033-1035 WEPOB62 ion dipole simulation electron HOM Contribution to a conference proceedings 2017 2017-01 http://dx.doi.org/10.18429/JACoW-NAPAC2016-WEPOB62 https://jacow.org/napac2016/papers/wepob62.pdf The goal of future operation of the low energy RHIC Electron Cooling (LEReC) accelerator is to cool the RHIC ion beams. To provide successful cooling, the velocities of the RHIC ion beam and the LEReC electron beam must be matched with 10⁻⁴ accuracy. While the energy of ions will be known with the required accuracy, the e-beam energy can have an initial offset as large as 5%. The final setting of the e-beam energy will be performed by observing either the Schottky spectrum of debunched ions co-traveling with the e-beam or the recombination signal. Yet, to start observing such signals one has to set the absolute energy of the electron beam with an accuracy better than 10⁻², preferably better than 5·10⁻³. In this paper we discuss how such accuracy can be reached by utilizing the LEReC 180 degree bend as a spectrometer.